Stoker construction



Filed April 4, 1931 2 Sheets-Sheet ATTORNEY mvENToR Cnnzxes E MxLLaE..

March 15,'1932. c. F. MILLER sToKER CONSTRUCTION Filed April 4, 1931ZSheets-Sheet WITN ESSES:

v INVENTOR CHARLES F. Muere ATTORNEY y oHAnLns r; MILLER, or ivroortus,vPENNSYLVANIA, iissrdioittroWrisrnirerrrousufannoerablyy supported bytheupper edges of such Patented Mar; i y Y mitica MANUFACTURING. C QMPANY,A ooRreoRrATIoN-or rnNNsYLvANIA, f 1

STOKER ooivsrnucrionl" y *"'Appllicetion imaginaire, 193'1'3 serial`1%.1527326;

` `My invention relatestopifogressivefeed -k "stokers of the multipleretort'underfeedztylpe-l and it has oran objectto .provideimprovedmeansfor supporting theretorts and tuyere's.

" 5 VIny accordancefwith'myinventioin Iprovideretorts includingsectionalized side walls together witlirbottom walls fmade upatieast inpart byfseeondary ramstructures@v The p V lan'df arrangement ofj'thelretorts and tuy're rows, certain parts being omittedffrom `port' er'toillustrate' more' clearly tuyres covering the tuy're spaces between4the side wallsA and adjacent retortsfareprefadjacent side walls.'4inventionjrrelatesto :improvedbe'am or girder members for .positioningvand supporting`v the retorts .and .the

tu'yeres,. the `beams positioning; and support-- ing the .retort sidewalls so as to define-alter# 'nateretort'fand tuyre. spaces andtheretort side walls supporting' the tuyres-at their.up per edges. Myimproved beam structure .cc'un-V prises a plurality .of 'abutting cast vsections, eachi'section being of trame-like formation and having` anupper `icompression member .anda lowertension member spaced-'apart by'strutmem'ber or members. Adj acent-sections aresecured 'together by'-bolts including ten'- f Sion bolts located near the lower tension memf`bersiof the abutting sections. In' thisgway,vv

1a built-upcastfbeamstructure may be i pro- -vided otadequate strength`and gone *whichV does not require the 'use ofkinterme'diate sup-vports. Not only is the strength. of `the beam Vprovided'toraby themost,advantageousfloca- -tion ofthe materi'alicomposing it,.'.tl'1atis,inV Y spaced-apart tension and .compression meinbersj:butl thecompression members may'v vbe made relatively thin and' `ot littleVdepth,

V.whereby the Vingress oi .air into the' tuyre spaces is facilitatedthroughout the llength -osuohspaces andthe open spacesbe'tween si',

the tension and the compression members provide for readydistributionandcircula-V :tion of'air throughout the space'underneathythe-structure and directly .underneathfthe' .compression 'members oi'.the 4girderbeain structures Amorel specific object of my'in# Yvention.is to provide a vstructure having these l permit longitudinal expansionof the stoker. rllnestoker is of afabricatedconstruction l.andcomprises-.fa plurality'otfspaced parallel .advantageous features ofconstruction' and operation. Y These andother objects .are eileoted vbymy invention, v as will be apparent from the fol- ;tionsof the Vstoklowing' description vand claim takenk in con.-

nection with the accompanying-drawings,

formingja part of this application, inlwhich:

Y *Figb-lis a longitudinal sectional `yview Uhrolllgh a letortfo'f "aStoker constructed in i accordance with the presentV invention Fig. 2Ais anenlarged plan viewiot thestoker y shown in Fig. l, illustratingthe construction the detail structure; andi? i Fig. 'f8 `isfafragmentary transversesection f takenl on the''line: III-1110i? Fig."l.1ff ff f 'Referring more in "detail tolfthe" construc-` tionillustrated, thereferencenumeral l0 in-` dicates, inV its entirety, astoker constructed in n accordano'eA ,with 1 the;V present `'invention.The stoker 'comprisesfin generalypara-llel alternately-arranged retorts11 and rowsof Vtuyres 12.` 1 C'oalislted' from'a hopper 13f'an'd intothe'end's ott-he retorts byipriniary-ra'ms dlll vreeipro'cating- Withinram'boXes l5'.` The Coalis'adva'nced along the retorts` andfor'cedupwardly and;` laterallyo'nto the tuyeresi'by secondary" 'ra-ms; 16-,reeiprocating longitudilf -nally of 'the vrptortsi "Air for combustion'is supplied from.A beneathftliesstoker and iows iorizontally 'throughopenings `provided in the tuyres andinto the: fuel bed. The Vresultingash'is movedfdownt-he Stoker Vby* Avirtue of its frictional Contact withthedown- `wardly moving tuelbed and'isV discharged Vfrom-the lower endby'conventionalv means,

not'shownpW i The stoker is supported at' the front by "a supportingconstruetion- 20F comprising `a Atransverse girder 21 anda-series ofcastings 221disposed in'abutting sideeby-'side vrelation 'along theupper face of the gi-rder; VYThe castlings 22Yare `bolted to the gird'er21.1' The nStoker is f supported at itsk lower lend v by Qa supporting;Vconstruction 23 vcomprisingz a girybythe .upper 'acei'of the-girder 24'so fas to beams '26' secured by bolts 27`and2'8 at vtheir "der 24 andcastingsQ disposedin abutting y side-byfsiderelation and slidablysupported lfree the retorts are provided by the secondary rams 16 and bydetachably-mounted bottom or guide plates 31 supporting the secondaryrams. The plates 31 are supported 1n position by brackets`32 which reston upper lateral flanges 33 of adjacent beams and are bolted to the Sideplates 29. The tuyeres 12 are disposed in overlapping stepped relationand bridge the distance between and are supported by the adjacent VsideVwalls of adjacent retort-s. 1 f It will thus be seen that the beams 26which `perform the load carrying function of the Stoker, are separatedfrom the burningl fuel by the sectionalized more refractory metal partsof the Stoker, and are maintained in a cool condition .by virtue of thiscontact with the air beneath the stoker. Furthermore, the beams-are aninherent part of the retort structure and serve as a positioning meansfor the retort side walls, vthereby determining the width of the airspaces between retorts.` Each beam is a frame-like construction andmaybe divided functionally speaking into a compression member whichyextends along theretort sidewall-and to which the side plates 29 arebolted, a tension member 41 connected at itsends to the member 40, andstrut members 42 and 43 spacing or holding apart the compression memberandthe tension member. Structurally speaking the beam comprises threeintegrally-cast Vframelike sections 45, `46, and 47 The section 45 issecured by the bolts 27 to the casting 22 and comprises acompressionsection 40a, a tension section'41d and a strut'section 42a. The section46 comprises a compression section 406, a tension section-41?) and strutsection 42?; and 436. The strut section 426 abuts the strut section 42aand is Vrigidly secured thereto by bolts`48 and 49, the bolts 49transmitting the tension stressesbetween the sections 41a and 416thereby making them functionally' speaking one member. The section 47comprises a compression section 400, a tension section 410, and a strutsection 430, the latter section abutting the section 43?) and rigidly.secured thereto by bolts 56 and 51, the bolts 51 serving to transmit thetension stresses between the sections 415 and 410 making these twofunctionally one. The lower end of 'the section 47 is rigidly secured bythe bolts 28 to the casting 25.

It will thus be seen that I have provided an extremely strong and lightbeam-for support-ing and positioningthe remaining parts of the Stoker.The type of construction permits :the use ofrelatively cheap material.Furthermore7 due to the sectionalized feature, its length may be readilyvaried to suitdifferent length stokers by omitting the intermediatesection, by varying the size of either of the sections, or by providingtwo ormore intermediate sections. Also, as the beam is of frame-likedesign, a minimum amount of-structure appears below the Stoker intheairchamber, and thereby reducing to a minimum the likelihood of Veddycurrents in the air supply which if excessive cause unplate-like beamsare not sufficiently strong to carry lthe Stoker load if excessive spansbetween front and rear supports are involved. Therefore, I provide agirder type of beam which does not function as a retort side wall butserves only as a beam to carry load, the elementsconstituting the retortside walls being supported and positioned by the girder beams.Therefore, having relieved the cast beams of the duty of themselvesproviding retort'side walls, it becomes possible to use the girderconstruction of the type herein disclosed wherein the extremecompression and tension-fibers are located at such distances from theneutral axis as to provide avery strong structure for the amount ofmaterial used. As most of the material constituting Athe girderisembodied in thejcompression and tension portions and as such portionsare located desired distances fromV the neutral axes as just pointedout, it will be apparent that-the construction is very strong for theweight of material used and that it is therefore possible to provide asupporting girder which can be made relatively much longer than the'typeof cast iron retort side wall beam heretofore used.

' While I have shown my invention in but one form, it will be obvious tothose skilled in the art that itis not so limited, but is susceptible ofvarious changes and modifications Vwithout departing from the spiritthereof,

and desire'` therefore, that only such limitationsshall be placedthereupon as are imposed by the prior art or as are specificallysetforth in the appended claim.

What I claim is In a furnace, the combination of spaced supportingstructures, parallel, alternatelyarranged retorts and rows of tuyresproviding an inclined multiple retort underfeed Stoker extending betweenand carried by the supporting structures and comprising a pluralitv ofpairs of longitudinally-extending, parallel beam members carried by thesupporting structures, the beam members of eac-h pair beingspaced apartso ast position the 'y retort side kWalls to define. alternately-ar-` Aranged retortvand tuyre spaces, each beam member comprising a pluralityof abutting cast sections and each section including up v percompression Vand klower tension members spaced apart by compresslonstrutmeans,

and bolts for securing yabutting sections togather including tensionbolts located ad-lV f jacent the lower Ytension members'of'abuttingsections. Y

In testimony whereof,A I have hereunto sub d scribed my name this 2ndday of April 1931.

y CHARLES F. MILLER.

